It really is simple, irrespective of all the talk re: "safety pilots and the logging of time", there will only ever be one person logging P1 at any given time, it matters not one jot which seat your in (R/L) so long as you can reach all controls necessary for safe flight.
PS: If you think the restricted P1 is going to cark it in the air stick him/her in the RH seat you in left and you will happy as larry if he goes.